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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cb5347ff5ef8ca3d16836ec318185998752ff1daf926e4fd39dcecb6e6b35ce' 
  AND token = 'MT8bynah3VMdvv+cdlPgzLxLHlNZ+VglkO1H1jncuoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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