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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b665f2f1fa4f144127f1d21ea651a4b2bfa794918111d827610b3419fe8c4cbd' 
  AND token = 'mnsBBu5kjVhayVVuLOPzXPLGPJZI1QlfylfSL2Ns1kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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