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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e75046b067ae65a2f61d96ca5aa731b7a00f9738c5a8a17b1507f9fa9d56ff9c' 
  AND token = 'r+ZRtt9DkqIaDqQ45H4jfAq25W/6ETKd7PjPrQNUx/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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