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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d3918917cc39e40d051719c8059420b08f98eb0677b4b00365685ef992a2e9' 
  AND token = 'FpYOpsh410rMtaWP6YVBk3+FuFfv+omNgulx2aQqcgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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