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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea9acd9fbd576b0f381347b74e5a9840908a33cbb3fc953f5cf0eea6d7ae329d' 
  AND token = 'zTdbG7ntGNkU5XrIPruW1KwSo3da0lJILPEy3b6roJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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