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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5332ae2b978d57aaba9e951c898a310f4c921b07d4a0fd4a0efe8dea65bf5a0' 
  AND token = '0Dv9BE+UG4XVtcDbu/CrSqMAR6ab710GxLsIy/itO6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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