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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffd18f5313fc6ad02a958cda97cdef5701d739b42c96c1ad70e5ad778bb56569' 
  AND token = 'c7iIOfah2HC0Ga/mZh/DHTsg8qSlB0AcbziS0cyk23I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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