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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ac52e90d0ef7ad71835aa8790a1f169b034bb234059849943eff0ff2cd3e70c' 
  AND token = 'qdDhXOSjtGKsuKbsccC7dZkLGcRFmBwEY6VhyVkEEN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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