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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a230f29a8d3bf5a2b80c233cd2c0c02143ad072f38e464230678f76dba46418b' 
  AND token = '13qzy88MSHw6uO9xPWLL5saberLzVVdfRUMvtBaPQZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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