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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ad124578d73d44db91f2cfa5e0fa20b3dddd04f128494a9db7f3a772bd49a41' 
  AND token = 'iKsBkTmzOgDMe1IwJt9My6im144eP/OReqT37n5/0RA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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