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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cc3d0e9801b6de7a4d66944fa4987d707793d01046388034a88c360c20b49c9' 
  AND token = '3fBLXNEhTqpBbSDr1hF47WT+LOCTjtEyAaC+b4a0C58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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