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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb37a504bce5333942acfdaa3464e5e4df85d3240453d36bfac6305dbf0ed590' 
  AND token = 'jIEJ3a3/JjVmwNoni5nK6GZVMye6+eSraRHs+gtW2Pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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