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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcb0fade21529a77a767a54fdca30176c6033aa82f26a79b6d0345a4d99ce514' 
  AND token = '87pZAoRYLXSpgeioau0Cd2xRYLpFMfMxc6HmXQsOULA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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