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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1433b74cff7d87a7a20a6bf60e1071edeb2d2538348b977e6c318a4c92b7fd54' 
  AND token = 'tBMNk+VOibdg9DrAMRVdpG06Dyq1yv9spozq1izz9XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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