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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14dacb7296ae0ab90604d13ac6a16f4b83b69b55624c5eb8d5656bc02296d415' 
  AND token = '3Dmt9xTRfFMciVgfblmNB35ByW72EDIx/MJ/fz2YMgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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