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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e39aa99b2271c1cc26eafab4a03478bd89186d1f29afb1eda7324d8100fe1b7b' 
  AND token = 'W0aciaYD0Rqnbjy7RENX3+L3STLMqcImg76z1CgYFW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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