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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '752548b047a3667b8e8c9dd9b3fb52601fa5d225b4b83d04886e8de8a8a092c0' 
  AND token = 'p8SKVbvfqs5iY3E59GYvcT/Ag9QqM97KaB9zWiDcnGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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