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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1eeadca9d06a0b967c5ce83dccb5122b77fd67a766c59bdeff2d3a519f352c9' 
  AND token = 'XbEyuVdLIxm87maQP5E4fCqHfU/J8NS0Ndi4e6yaKb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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