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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c827eaa5b2909ef1d58a36deee9b7c7f710fbc939215f572e5a6eaa5b29e1321' 
  AND token = 'dFZd50rsVc+Rv7aNlB2l+9+Tc3e2CkQ/IMOUt7jXjoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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