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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a62df15d645f421f31055a2ab36f6db9b869cdda93a785f1d01d277d5cfbb1b0' 
  AND token = 'P14uslwZHOO11yf2yO5nT2d1esWsYRveS5mKFtv57Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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