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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ac32087059c2d063c2afe4a3c3afaa1f71e358bb57350596e1b98a895a49d72' 
  AND token = 'm2cRcI0RFLag0BSE5JlSENdfyhj1vknjuor7TtnH/ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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