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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '692bdaaf397b0e492ed46d849edfce842400cdec89f74be1c2d3b8a5eb6273ca' 
  AND token = 'HvlZicAX/I7JtshTAL1i08idMMqPionR/iFv0hBeEnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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