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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '923d08f9e11d4a18059faa61de79be9222f74bdbcf8a2e050c4028c2c9407940' 
  AND token = 'ihS2AqzPkVTAltMBzfEHv19/17TcrgAk4WvGU7+cRmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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