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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '539f562c8b504b487b0fc15130c7cf6dc13871617e0590f9e035b142ffca85aa' 
  AND token = 'q0gaO26Ox/AAUE+5o5888liJnNrPvWvd0SUSQSP22Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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