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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64f2ae66b0d884a12be2879cad86886caf512c31cb33bcf1193efda8ee94e5d7' 
  AND token = 'zDT4olll5PNFzmlQY+fX4HoNkoVC8gB/2mXijC3Vq2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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