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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c0cddc3f2886192deb41c7b8d8e24597da643a7e8db902c9c8fe74bdcf19a62' 
  AND token = 'aXfkoDhTbdwCQEHDWhjIJ+86nDB8GJle8bE0r6+8PIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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