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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b7077274007ac4110925766136740a3844bec7ea3e25287b22accbf9f37d2a7' 
  AND token = 'h0Uwqu4BR3JOexPRtBdlvDA683j2e/YyIhdxayHPEnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00166

JSON explain

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