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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fbdb1bf74e6154a51ce7e17b7a8d7a1ae2514d78b6fb5bf98ea00d4bf7726d3' 
  AND token = 'D84ZScdUMwxESOfRFckhwjRBohzz7OCJeENi1NvTqwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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