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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b538a829ffb535370dbbbee0368e0448d402b3b039a9e3ac88e7f89e4b66ac81' 
  AND token = 'gRKUAk6Ty5GmJu/8lI1N9H0BiVyEoHT5NeOZY1jQgSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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