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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ed7e20b134f48671ec5f4e2e7dd802a802d377f525cb46b4dc16f81c49c3e2' 
  AND token = 'Ni3ZO80Fb/Pos5OG3m6neQS6vfWEJgYsaWHFJiUf6OA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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