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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1109631866955cd1417680194b21aaef21d3cc769291ca61cd6fc5dc18660dbc' 
  AND token = 'uhIbraz0yPs0PuziW37ArEl+oP3Kx/KA+kkklS7iaHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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