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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d6df4e6b7694d332f94a3591d85ceb53e04dec89b8aec42b5a2f5b13e77102c' 
  AND token = 'rOPa+ffI26+ybzuysyaODtaFhv+tG8hYn8x+YRKgUkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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