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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1443492720fe93b4b9e9940e404a1a5611044fa3addd03d3fbc0e7a6064ada5d' 
  AND token = 'avSpPENTorxTToJBz0Z8fbjRDgNpwfo03OjL4TE3z5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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