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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c83b1c1fbdafb039afdc885e12ecde17c0e15c68fdf733846765cd3e1b11dc30' 
  AND token = 'vlJzLIRa2xo/s+BIqh9jTI61yyLLempyH70d13eXI20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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