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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb4e2956d6ba46e41cb73aa95e36741f9162512a35f2140c3536c696c4c4c1b6' 
  AND token = 'KBMs1D4bEvgLFjBVBbzYjE1LYq6oqWZhu43cOm5xPBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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