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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec7003eec2c92973d6066e99930a6e942cee3e2623508fb41dd5d9ebce7b82e3' 
  AND token = 'R96r5h18pIQTkRLGrYFLWxYSFbop+/8/QhQ+DqgU2R4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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