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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '086c256059d2e0dab9297a2a466a4ae9591c2cdd6a88452ff64a2e815577aa66' 
  AND token = 'rYIfNvsQIMP/SepOsRHj+afjZm24QEqvv+GRllIjr7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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