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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e8a63a0b25df4b5bcdd83b3dd22cb32f93924c9cb260a963c01b6cc8fa206bd' 
  AND token = '/3VFruFHYYwJ8Rn/Od1FhOpPov3zIzwceQ+1qoH2gJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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