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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd03e1777373237b514958ee409d3f370607368ac96abe38ed941afbcdb5116c' 
  AND token = '5KupS1+mGXoN17qxPKXSHvqB681hN8Cx9TBIPwh+doA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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