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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa1abdfa3bed2d5fb540f3ad54e66fb166d58c15c8039a3218f4f99363599485' 
  AND token = 'cSLzEJzUPpOGQUOS3VU+a8QnVoRfRjIp4DGS51r32Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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