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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b592a022f67d1bd813496734d8c79f637e1ea1666c42ee88edfea002730fe2a' 
  AND token = '0tS2mVBllWCXR1GXfuW90Lm9sV55SRhnrTAQytvSadY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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