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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fabdf94c4c41ffb84bf3e05cf2ae8761d5918d25ded0feb57c400f7678ff497a' 
  AND token = 'pNclE2sbLpNkhJxvdj4ZL5YRbrfF27d5/PEn+xxBxqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}