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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '028b46dbf8a6790aa7b58c30c3e4b3f58052c45c5fbbe2c7ab974c3e3c316f0e' 
  AND token = 'd4iuznrZzu+Ib7JtB7cq6u3inxEx5T64p56Kt0D74s0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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