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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '550c6dc5d0535ff258eda688b116632f23f08893c8026d0317677e9f3eeea025' 
  AND token = 'UMyaOzctpy/qCm7piQCcgE0qX5GJ8EwHc2Cn/KF3vsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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