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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '262168a480f116522b695d696254471178f5194de02e34262fc11444b55ae719' 
  AND token = 'pdCcJbV3XoMHWL42EQSP6uXk/UbrKGp0F0yB9vfPca4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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