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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c9c0ff1df8bc03134ab151c6f81bca8a16356624aaf7825d949d3b0cfb4b39e' 
  AND token = 'Pbf9P3Q9u0pe6NVxSbZC3QX/NFxNxgCCLs4Z5QDOsro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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