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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da90357b9f929a46a676c5ebb22338b8daf626aafbd8ce72782cdb27a869ef01' 
  AND token = 'tuClGmCuAkaWvl0cRsDCx5AbgKj+CkcJoxB8F/W/Y+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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