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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e583a892f9853866c19079a9a57e10a7a3fce66a20c6291eea328eb7debda39' 
  AND token = '/0+UzGOLA098QTFZvyS2FnRgg6TWz1gMEdJDw6MSBLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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