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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96bc82a8d33f13105e9d3366958c8d9918628e0790bac26f1ba84dcdd4424435' 
  AND token = '0zUkYYvOL9oWGMsqNPcYKOy9jOra3iYW5mKNMgVzX+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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