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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2d48415ae28e10c8f96cd6922ab7bfa6ebd6bcc5c2d343753228f2b79dca56f' 
  AND token = 'KlX1qm/Gfoeu95KwnUhsiMheU7pXhvMQzddZtQ5dUQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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