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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd780e141a3c460ac877bd934f442b1e0adb24e06e8633f48f6cca39c067ef17e' 
  AND token = 'AsZb6ZSPJZC4Yy87m8IbU2zW93q9Dv8VZ+EM9Totjdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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