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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b371bdb1cd523552a7f2a9643134a830fb6de8c37a637cae81a6b47b4c9b8e5' 
  AND token = 'kLJIoe69DT4axCCWlU3v9dBzANzmTVqRzv9436hqUPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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