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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '469ff6c489345c08cd5d8601904a0cecda7fdd1663b5df78a3bdb70c88e2dee9' 
  AND token = 'Zkr3Ap5OOvn1XrN9PyKPtKeNaCH9Unuy/0AvlkrjnnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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